Request: Can someone accurately weigh a Bronco 302 flywheel, 11" pressure plate and disc?

[nvrstuk]

Stock Bronco V8 rotating assembly is what I'm looking for. 11" flywheel with ring gear of course, plate, and disc. Bolts would be helpful but I can dig those out of my used bolt bin.

Just gotta be very accurate. Like hold the parts in your hand on the scale, put the parts down and do the math accurate. Not RockAuto shipping weight accurate! lol

Thanks!

 

[DirtDonk]

You want an original pressure plate and disc? Or can it be aftermarket replacement?

 

[bmc69]

I can get that for ya.

 

[nvrstuk]

Thanks BMC69!

Good thought Paul- I think either is fine. Even tho there might be a discrepancy it would be a common replacement part.

 

[DirtDonk]

Yep. There could be minor discrepancies among stock three finger “Long” type. But perhaps an even bigger discrepancy between a Long and a diaphragm type.

Even replacement flywheels could have pretty large variations I would think.
If it was a period correct and Ford part numbered model it’s probably almost an exact duplicate for an original. But a replacement flywheel over the last 30 years could be one variation or another on the same theme I would think.
And at those substantial weights, a little bit could be a big difference.

But you’ve had me curious from the get-go. Can’t wait to find out what you were needing the exact weights for.

 

[nvrstuk]

I was wondering who was going to ask!

You know me... lol

I will post up when I get my weights and can do my side by side comparison.

Then I'll ask some physics or math expert to help me do a "true comparison".

More later!!

 

[bmc69]

164 tooth flywheel is 29 # Total weight of flywheel plus clutch

with a 10.5 Centerforce Dual-Friction is 53#. Total weight with stock 11" diaphragm clutch..52.5#.

 

[nvrstuk]

Thanks. Just got home so I'll post up later tonight.

Appreciate it!!

 

[nvrstuk]

Ok Paul-

I wanted to compare spinning weight between all the clutch parts for a manual and an auto WITH the additional 13#'s of weight with a SpeedGems converter adapter.

I posted up the rest pf the info in my Shorty build thread

 

[DirtDonk]

Gotcha. I read the other post just now. Interesting fact finding mission.
Something extra to put down on your list of various weights and measures.

 

[nvrstuk]

Basically I wanted to know how much I was giving away. Guys after ET's are going to smaller converters for several reasons and one is weight. Quicker revving. Just wanted to know if going with the SpeedGems and adding 13 extra pounds was going to be a huge % difference compared to a clutch rotating weight. Don't want it to make a slug out of my motor.

 

[nvrstuk]

Thanks to a fellow CB member I got a lead on a reputable converter builder. He can build whatever and I asked about weight and he figured about 34 lbs max.

Almost a wash with that monster of an adapter for the SpeedGems adapter. Not much of factor anyway, it's spinning weight but it adds up.

 

[Broncobowsher]

Remember it isn't just the weight, but the distance from the center line of rotation as well.
The old flathead V8s had extra weight added to the flywheel to help smooth out the engine. It was called an inertia ring and it placed a lot of weight at the very outside diameter of the flywheel. Just to add to the inertia, the opposite of what hot rodders want to do. Image from the Jalopy Journal.

 

[ssray]

Another good example from the good ole days!

 

[nvrstuk]

Yup, I'm listening to good examples of inertia rings as large swathers and balers this am are working in the fields nearby.

I live in Deere country. lol
This one looks like he got caught up in berry or fruit netting. Rosie's FT job is keeping them put of the garden/yard and I chase them out of the barn almost every day. Got a 4x5 drop tine here too...

 

[Broncobowsher]

Another good example from the good ole days!

I never thought of those that way, but that is exactly what is going on. The mass at the largest radius, the spokes in the middle just keep it together. The outer ring truely is the the flywheel. The most flywheel with the least material. Take that same metal and just make a shaft and there will be nearly no flywheel to it.

 

[nvrstuk]

All the old tractors and any large flat drive belt setups are this way.

Literally hundreds of lbs- all on the outside perimeter.